Who codes/maintains Proftpd?

As with all Open source projects, no one person can really lay claim to
the entire package. The ProFTPD project was started by Floody who took
it to approximately 1.2.0pre2/3 before he found that his available time
was insufficient to handle this project as well as his other commitments.
From approximately mid-1999 MacGyver took over the project and pushed
it forward getting 1.2.0 out into the wild. From early 2002 TJ took
the reins of the project and started to get releases and new features
into the code.

There are also numerous people involved in developing modules and
documentation for the project. A number of these have been merged into
the core distribution and more are likely to follow.